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authorRoland Dreier <rdreier@cisco.com>2009-09-22 16:43:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:29 -0700
commit70867453092297be9afb2249e712a1f960ec0a09 (patch)
treecf753b5467e3a93fafd6bb452292e6ec60c3de86 /include/linux/kernel.h
parent02b51df1b07b4e9ca823c89284e704cadb323cd1 (diff)
printk_once(): use bool for boolean flag
Using the type bool (instead of int) for the __print_once flag in the printk_once() macro matches the intent of the code better, and allows the compiler to generate smaller code; eg a typical callsite with gcc 4.3.3 on i386: add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-6 (-6) function old new delta static.__print_once 4 1 -3 get_cpu_vendor 146 143 -3 Saving 6 bytes of object size per callsite by slightly improving the readability of the source seems like a win to me. Signed-off-by: Roland Dreier <rolandd@cisco.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kernel.h')
-rw-r--r--include/linux/kernel.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 0a2a1908786..55723afa097 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -252,10 +252,10 @@ extern int printk_delay_msec;
* Print a one-time message (analogous to WARN_ONCE() et al):
*/
#define printk_once(x...) ({ \
- static int __print_once = 1; \
+ static bool __print_once = true; \
\
if (__print_once) { \
- __print_once = 0; \
+ __print_once = false; \
printk(x); \
} \
})